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Are you worried about the bathtub or the bathmat as a source of germs? There's something even dirtier in your bathroom—the water glasses. When a hotel maid is cleaning your room at the end of an eight-hour shift, don't fool yourself into thinking those glasses came straight from the dishwasher. The most you can expect is a quick wipedown of those glasses. Your job? Rinse them under hot water for a couple of minutes before using.